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Discussion Starter #1
Don’t usually make it over to visit the D-Max guys but need some help.

A Co-worker has a 2002 duramax with a manual trans, ~72K Miles, the truck idles fine and under gentle acceleration runs well. However, under hard acceleration the truck jumps and bucks at 2000 rpm. Hooked the scan tool up and at 60% throttle the Fuel rail pressure drops to ~3k PSI while commanded is up around 17K PSI. It did not throw a CEL but it did trigger code P1093C (Fuel Rail Pressure Low During Power Enrichment). This problem presented itself the last time we had a cold snap, he replaced his filter but it warmed up the next day, turned cold again and its back. That was about a month ago. We fill up at the same station so I don’t believe it’s a fuel issue. That said I fill up at the high flow pumps and he has to use the auto diesel pump due to his smaller filler neck. The station only has one tank.

Thanks,
Evan
 

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Sounds like injectors possibly have the balance and return rates checked. If out of spec he is covered under Injector 7/200,000 warranty
 

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Blue smoke at start up means injectors
 
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